US3394792A - Package indexing device - Google Patents

Description

July 3 1968 B. A. ARVIDSON ETAL 3,394,792

PACKAGE INDEXING DEVICE Filed Dec. 12, 1966 10 Sheets-Sheet l jevggt Q. Qruidsom Er nest C. Clement,

July 30, 1968 B. A. ARVIDSON ETAL. 3,394,792

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July 30, 1968 B. A. ARVIDSON ETA. 3,394,792

PACKAGE INDEXI NG DEVICE Filed Dec. 12, 1966 10 Sheets-Sheet 10 United States Patent 3,394,792 PACKAGE INDEXING DEVICE Bengt A. Arvidson, Villa Park, and Ernest C. Clement,

Oak Park, Ill., assignors to Corley-Miller, Inc., a corporation of Ohio Continuation-impart of application 570,070, Aug. 3, 1966, now Patent No. 3,353,653, dated Nov. 21, 1967. This application Dec. 12, 1966, Ser. No. 601,175

Claims. (Cl. 198-39) This application is a continuation-in-part of an application of Bengt A. Arvidson and Ernest C. Clement, Ser. No. 570,070, filed Aug. 3, 1966, now Patent No. 3,- 353,653.

This invention relates to package handling mechanism and, more particularly, to a package indexing device associated with a weighing scale and package labelling mechanism.

An object of this invention is to provide a new and improved package indexing device having simple, troublefree mechanism including conveying mechanism on a scale platform which receives packages of various sizes and shapes as may be delivered in a random fashion thereto and sequentially delivers packages to the scale platform of a weighing scale for making weight.

Another object of the invention is to provide a package indexing device in which a lead-in conveyor intermittently carries successive packages to a package stop with a transfer conveyor operated intermittently to advance successive packages across the stop and a supporting package conveyor on the scale platform operated intermittently to receive and deliver a package to a central location relative to the scale platform in one cycle of operation and in the next cycle of operation to remove the package from the scale platform and deliver it to mechanism, such as a labeller, for applying a label to the package.

A further object of the invention is to provide a highspeed package indexing device wherein a package delivered by a transfer conveyor across the package stop to the area of the scale platform will be received by a high-speed conveyor which operates continuously and which can move up and down relative to a grid structure supported on the scale platform to obtain quick movement of a package and whereby lowering of a package by the high-speed conveyor will cause the package to be engaged by the edges of the grid members to act as brakes on the package and provide minimum coast of a package.

An additional object of the invention is to provide a package indexing device as defined in the preceding paragraph wherein the high-speed conveyor associated with the scale platform is mounted independently of the scale platform and comprises a series of spaced rollers rotatable continuously at a high speed and which have an upper position in line with the transfer conveyor and above the grid structure to receive and convey a package to a location overlying the scale platform and which have a lower position to cause the rollers to move to a level beneath the top of the grid members whereby the drive is removed from a package and the lower surface of the package is engaged by the edges of the grid members which extend in a direction normal to the path of package travel.

An additional object of the invention is to provide a package indexing device as described in the preceding paragraph wherein the high-speed conveyor rollers are mounted on a frame which can be pivotally moved to an elevated position to provide access to the scale platform and grid structure supported thereon for cleaning and servicing of the equipment.

A further object of the invention is to provide a package indexing device in which a package can be delivered to the scale platform without any vibration of the scale by the conveyor mechanism to have the package placed on the scale platform similarly to hand placement thereon and avoid any requirement for interlocking of the scale with the package conveying mechanism which is normally required to prevent operation of the scale until vibrations have ceased.

An additional object of the invention is to provide a package indexing device having a lead-in conveyor which intermittently operates to carry successive packages to a package stop with a transfer conveyor operated intermittently to advance successive packages across the stop to a conveying mechanism for placing packages on a sacle platform, with means permitting certain of the lead-in conveyor rollers adjacent the transfer conveyor to freewheel when the transfer conveyor is operating whereby a large package resting partly thereon can positively move across the stop to the conveyor associated with the scale platform.

Further objects and advantages will become apparent from the following detailed description taken in connection with the accompanying drawings in which:

FIG. 1 is a front elevational view of the package indexing device, shown in association with a weighing scale and package labelling mechanism;

FIG. 2 is a plan view of the structure shown in FIG. 1 except for the label applying mechanism;

FIG. 3 is a vertical section, taken generally along the line 3-3 in FIG. 1;

FIG. 4 is a plan section, taken generally along the line 4-4 in FIG. 3;

FIG. 5 is a vertical section, taken generally along the line 5-5 in FIG. 4;

FIG. 6 is a fragmentary view of the structure shown at the upper right-hand corner of FIG. 5;

FIG. 7 is a vertical section on an enlarged scale, taken generally along the line 7-7 in FIG. 2;

FIG. 8 is a vertical section taken generally along the line 8-8 in FIG. 7;

FIG. 9 is a fragmentary vertical section, taken generally along the line 9-9 in FIG. 4;

FIG. 10 is a timing diagram of the operative mechanism of the package indexer.

FIG. 11 is a fragmentary plan view of an alternate embodiment of the structure with parts in sections;

FIG. 12 is a fragmentary side elevational view of the mechanism shown in FIG. 11;

FIG. 13 is a vertical section, taken generally along the line 13-13 in FIG. 12;

FIG. 14 is a fragmentary View of the second embodiment taken generally along the line 14-14 in FIG. 11 and generally corresponding to the view of FIG. 5 and with the scale conveyor shown in an alternate position in broken line;

FIG. 15 is a fragmentary view of the structure shown at the upper central part of FIG. 14;

FIG. 16 is a view, similar to FIG. 12, showing the parts in another operative position;

FIG. 17 is a vertical section, taken generally along the line 17-17 in FIG. 14; and

FIG. 18 is a fragmentary plan view of the structure shown in FIG. 15.

While this invention is susceptible of embodiment in many different forms, there is shown in the drawings and will herein be described in detail an embodiment of the invention together with an improved modification thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention 3 to the embodiment illustrated. The scope of the invention will be pointed out in the appended claims.

An over-all assembly of the structure is shown in FIG. 1 in which a portion of the package indexer has a frame, indicated generally at with legs 10a, adjacent a table 11 mounting a scale 12 having a scale platform 13 disposed between the frame 10 and a package labelling mechanism, indicated generally at ,14. The package labelling mechanism is disclosed in an application of Arvidson and Treiber, Ser. No. 451,742, filed Apr. 29, 1965, and reference may be had thereto for a more detailed understanding of the construction. For understanding herein, it only need be understood that a conveyor 15 of the label applying mechanism receives a package from the scale platform 13 and delivers it to a position wherein mechanism can receive a printed label and apply it to the package. The label will be printed with the weight of the package and the price and, normally, also the price per pound, with this information being established by a computer 16 associated with the scale 12 and the label applying mechanism 14 which has the label printer as a part thereof.

The frame 10 has spaced-apart front and rear plates 20 and 21 which mount, therebetween, the prime mover for the package indexing mechanism, as well as a number of operating components including the lead-in conveyor and transfer conveyor for packages and the package stop. A plate 22 extended from the rear wall 21 mounts a motor 23 having an output shaft with a pulley 24 driving an upwardly extending belt 25 engaging an input pulley 26 for a gear reduction unit 27. The reduction unit 27 is mounted on a panel 28 extending across the mounting frame between plates 20 and 21. The gear re duction unit has an output shaft with a pair of coaxial drive sprockets 29 and 30 for driving a pair of chains 31 and 32, respectively (FIG. 5) for driving parts subsequently to be described.

The frame plates .20 and 21, adjacent their upper ends mount both a package lead-in conveyor and a transfer conveyor. As shown in FIG. 2, the lead-in conveyor ern bodies a series of live rollers 35 extending from front to rear of the frame 10, with the left-hand end roller being identified at 35a and the end roller at the other end identified at 35b. These rollers are intermittently driven by means to be described to advance a package to a package stop 36 positioned at the end of the frame 10 and immediately in advance of the scale platform 13.

A transfer conveyor is positioned immediately in front of the package stop 36 and embodies a pair of rubbersurfaced rollers 37 and 33, as shown in FIG. 2, which can free-wheel when a package is being advanced by the lead-in conveyor rollers 35 to permit advance of a package into engagement with the stop 36. When driven, the rollers 37 and 38 will move a package across the stop 36 when the stop has been lowered to a non-blocking position. Although the rollers have limited engagement with the underside of the package, this is sufficient to move a package because of their high friction surface.

A package detector 40 is located immediately in front of the package stop 36 for detecting the presence or absence of a package for a purpose more fully set forth hereinafter and when depressed can fit in centrally located recesses in the surface of rollers 37 and 38.

With the structure described, a package P can be placed against an adjustable package stop 41 on the lead-in conveyor rollers 35 and repeated intermittent operation of the rollers 35 will advance the package to a position against the package stop 36 as permitted by the freewheeling rollers 37 and 38 of the transfer conveyor and with the package depressing the package detector plate 40. The timing of operation is such that when the package stop is up the lead-in conveyor 35 is operating and the transfer conveyor rollers 37 and 38 are free-wheeling, while when the package stop 36 is down, the lead-in conveyor rollers 35 are inactive and the transfer rollers l- 37 and 38 are power rotated. With this action, a succeeding package cannot be moved into the transfer area, while a package is being transferred across the package stop 36.

An important part of the package indexer is the means which conveys a package after it is moved across the package stop toward a weighing position and, in the next cycle after weighing advances a package off the scale for a subsequent operation, such as label-applying to the package. As shown in FIG. 2, the scale platform 13 has a series of live rollers 45 extending from front to rear of the scale platform 13 and across the width thereof. These live rollers are driven at the same time as the transfer conveyor rollers 37 and 38 and for an interval of time to receive a package and support it and move it to a position located centrally of the scale. The drive of the live rollers 45 is then stopped for an interval to permit weighing of the package and, in the next cycle, the live rollers 45 are driven to remove the weighed package from the scale and to receive the succeeding package if one has moved across the package stop 36. As subsequently described, the live rollers 45 are only intermittently driven and no moving parts are operating while the scale is making weight to avoid any vibration of the scale during weighing. The live rollers 45 and mechanism associated therewith can be considered as part of the tare weight when balancing the scale.

The foregoing mechanism can now be described in more detail, with the infeed conveyor rollers 35 being shown particularly in FIGS. 4, 5, 8 and 9. Each of the rollers 35 embodies a central shaft having a cylindrical outer member 51 mounted on the shaft 50 by bearings at each end, such as bearing 52, shown in FIG. 9. The ends of the shaft 50 define mounting pins fitted into openings in the frame plates 20 and 21, with the openings 53, as

' shown in FIG. 9, being vertically elongate to permit slight floating movement of the live rollers 45.

A pair of removable, generally L-shaped cover plates 54 and 55 associated with the frame plates 20 and 21, respectively, engage the ends of shafts 50 to hold the rollers in their mounting slots in the frame plates, as shown in FIGS. 8 and 9. The drive for the rollers 35 is derived from the endless drive chain 32, previously referred to, which, as shown in FIG. 5, passes about sprocket 56, idler sprocket 57, sprocket 58, sprocket 59, sprocket 60, and adjustable sprocket 61.

The idler sprocket 57 is mounted on a pivoted arm 63 which, under the urging of a spring 64 connected to bracket 65 takes up slack in the chain 32. The sprocket 61 is carried on an arm 66 pivoted on a mounting shaft 67 extending between the frame plates 20 and 21 and connected by a sleeve 68 to an offset arm 69 carrying a cam follower roller 70 operatively engaged with a cam 71 fixed to a rotatable cam shaft 72. The arms 66 and 69 are urged pivotally about shaft 67 by a tension spring 73 connected to a bracket 74 on the rear frame plate 21. The sprocket 61 is drivingly connected to a coaxial drive pulley 75 (FIGS. 4 and 5) having an endless belt 76 extending therearound and, as shown in FIG. 5, passing about a pair of guide pulleys 77 and 78 underlying the end lead-in conveyor rollers 35a and 35b and extending beneath the ends of rollers 35 adjacent the rear frame plate 21. The belt 76 is supported intermediate its length by supporting rollers 79, 80, 81, 82, and 83, which are grooved to provide guiding flanges with additional rollers therebetween also providing for support of the belt 76. With the floating action of the rollers 35, the weight of a package will press the rollers against the belt to result in rotation of the rollers in a clockwise direction, as viewed in FIG. 5, as the upper stretch of the belt 76 travels from right to left, as viewed in the figure. The drive of belt 76 is intermittent, dependent upon the action of cam 71. When the cam follower 70 is on the low of the cam 71, the spring 73 is effective to lower the sprocket 61 and drive pulley 75 to tightly engage belt 76 and cause movement thereof, while when the follower 70 moves onto the high of the cam 71, the belt 76 is slacked so as to not be driven.

Reference has been made to the cam shaft 72. This shaft is driven by the chain 31, previously referred to, which passes about a take-up sprocket 90 and about a sprocket 91 fixed to the shaft 72, with the latter shaft being rotatably mounted between frame plates and 21.

The package stop 36 and the mechanism for operating the stop are shown particularly in FIGS. 3 and 4 wherein an arm 92 is pivotally mounted on a shaft 93 extending between the frame plates 20 and 21 and has a cam follower roller 94 engageable with a cam 95 on the cam shaft 72. The forward end of the arm 92 has the upstanding package stop member in the form of a plate secured thereto. This plate, as shown in FIG. 3, is relatively thin and can extend upward between the transfer conveyor roller 38 and the first roller of the platform conveyor. Approximately two-thirds of the cam is a high surface whereby the package stop is in elevated, blocking position, while during approximately one-third of a cycle of the cam, follower roller 94 goes onto the low of the cam to permit lowering of the package stop 36 under its own weight to a level beneath the top of the transfer rollers.

The transfer conveyor rollers 37 and 38, which have a slightly higher effective surface than the lead-in conveyor rollers 35, are intermittently driven and at other times are free-wheeling, as previously mentioned. The intermittent drive of these two rollers is accomplished by means of mechanism shown in FIGS. 4, 5 and 6 and comprises a belt passing about a pulley 101 coaxial with the sprocket 59 and driven thereby and about a pulley 102, with the pulley 102 rotatably mounted on an arm 103 pivoted by a pivot bearing 104 mounted to the rear frame plate 21 and which carries the sprocket 59 with a cam follower roller 105 on the arm engageable with a cam 106 fastened to the cam shaft 72. A spring 107 connected between an end of the arm 103 and a bracket 108 on the rear frame plate 21 urges the cam follower roller 105 into engagement with the cam 106. With the arm 103 pivoting about the bearing 104 when the follower 105 goes onto the low of the cam 106, as caused by the spring 107, the belt 100 is moved up into yieldable engagement with the surface of the rollers 37 and 38, as shown in FIG. 6 to impart clockwise rotation to these rollers. As shown in FIG. 10, approximately twothirds of cam 106 is a high, so that the drive belt 100 is lowered to permit free wheeling of the transfer rollers 37 and 38, while during one-third of a cycle the transfer rollers are driven to feed a package across the package stop 36, which is at the time that the package stop 36 is in its down position.

The arm 103 carries an intermediate adjustable tension roller 110 for the belt 100, as shown in FIG. 6.

The platform conveyor for the scale platform and the drive mechanism therefor is shown particularly in FIGS. 3, 7, and 8. The live rollers 45 of the platform conveyor are mounted between a rear plate of the scale platform 13 and a front plate 121 interconnected beneath the live rollers, with the rollers being mounted in elongated slots in the plates 120 and 121 and being of the same construction as the lead-in conveyor rollers 35, previously described in detail and also shown in FIG. 8. Means for intermittently driving the platform conveyor rollers comprise belt means in the form of a pair of belts 122 and 123 each passing about a centrally positioned doublegrooved pulley 124 and extending over support rollers 125 whereby the upper reaches of the belts lie immediately beneath the forward ends of the rollers 45. The belt 123 is additionally guided by guide pulleys 126 and the belt 122 by guide pulleys 127. The drive belt 122 extends to a position to wrap about a pulley 130 mounted on a plate 131 extending downwardly from the front plate 121 of the scale platform. The double pulley 130 has a groove 132 about which a belt 133 hangs and extends to either side of a driven wheel 134 fixed to a rotatable shaft 135 which mounts the sprocket 58 driven by the chain 32. The belt 133 is maintained under tension by passing about a lower pulley 136 mounted on a pivoted arm 137 urged downwardly by a spring 138 connected at its lower end by a pin 139 to the plate 131 supported from the scale platform.

With the parts shown as positioned in FIGS. 3 and 4, the belt 133 does not engage the driven wheel 134 whereby there is no connection whatsoever to the platform conveyor mechanism, so that the scale platform is free for movement and can make weight of a package which is stationarily supported on the scale platform and with there being no vibration transmitted to the scale. In order to connect the drive to the platform conveyor rollers 45 by driving the belts 122 and 123, the belt 133 is brought into engagement with the driven wheel 134. This is accomplished by swinging a pair of rollers and 146 to a position to engage the belt 133 and actually move opposite reaches of the belt toward each other into engagement with the groove of the driven wheel 134, as shown in FIGS. 7 and 8, whereby the rotation of the wheel 134 is imparted to the belt 133. The rollers 145 and 146 are mounted on a plate 147 pivotal on the shaft 135 and having a pin 148 engageable in a slot 149 of an arm 150 pivotally mounted on a shaft 151 extending between frame plates 20 and 21, with the arm carrying a cam follower roller 152 engageable with a cam 153 on the shaft 72. The cam follower 152 is caused to follow the cam 153 by means of a tension spring 154 connected between the arm 150 and a bracket 155 fastened to the lower part of the frame 10, as shown in FIG. 3.

As shown in FIG. 10, the cam 153 has a high operative through approximately two-thirds of a cycle to keep the arm 150 elevated to thereby not drive the platform conveyor, while approximately during one-third of the cycle the platform conveyor is driven at the same time as the transfer conveyor rollers 37 and 38.

The shaft 135 is supported by a pair of brackets and 161, as shown in FIG. 8, having bearings for receiving the shaft 135 and having their lower ends connected to a shaft 162 extending between the frame plates 20 and 21.

When the package indexer is not delivering packages, it is desirable not to operate the platform conveyor rollers 45 and this is accomplished by the package detector located immediately in front of the package stop 36 and having the plate 40 engageable by a package for depression thereof from the position shown in the drawings. The plate 40 pivots about the shaft 50 of the roller 35b, which has the central section thereof removed and has a depending arm with a notch 171 engageable with a pin 172 extending from the arm 150, as shown in FIG. 4. When a package is present in front of the stop, the plate 40 is depressed into recesses in transfer conveyor rollers 37 and 38, with the result that the notch 171 in the arm 170 is moved out of position to receive the pin 172 on arm 150, whereby the arm 150 can go through its normal cycle. If a package should not be present, as the arm 150 is elevated, the pin 172 will fall into the notch 171 so as to hold the arm 150 elevated, with the result that the platform conveyor rollers 45 are not driven until such time as a package depresses the detector plate 40 to free the arm 150 for operation under control of its cam 153. A package may be on the platform conveyor when the detector operates to stop the conveyor and this package can be removed manually.

As shown in FIG. 4, a pair of micro-switches and 191 are provided under the control of cams 192 and 193 on the cam shaft 72 to tie in the package indexing with the scale whereby the scale will not operate until the platform conveyor rollers 45 have stopped and will not start unless the scale has made weight.

In operation of the mechanism disclosed herein, a package is placed on the infeed conveyor rollers 35 against the locating member 41, with the latter member being adjustable relative to the center line of travel of the package by mechanism, not shown. The infeed conveyor rollers 35 are driven for the first 120 of the cycle, as show-n in FIG. 10. When a package reaches the package stop 36 after one or more cycles, which is in up position during this interval, it will be blocked and can move into engagement with the stop as moved by the rollers 35, since the transfer rollers 37 and 3,8 are in free-wheeling condition. At the end of 120 of cycle, the infeed conveyor rollers 35 stop, the package stop 36 lowers to permit travel of the package across the stop, and the drive to the transfer conveyor rollers 37 and 38 starts to move a package across the stop. Because the infeed conveyor rollers 35 are not operating at this time, a succeeding package will not be advanced toward the package stop. At the same time that the transfer conveyor rollers 37 and 38 are operating, the platform conveyor live rollers 45 are also operating to receive a package delivered across the package stop and deliver the package to approximately the center of the scale platform while still supporting the package. This occurs up to 240 of cycle and then the transfer conveyor and platform conveyor are stopped and the package stop 36 is moved up, with the infeed conveyor still not operating. At the beginning of the next cycle, the operation is repeated. During the next cycle, the package that has been weighed on the scale platform is moved off to the labelling mechanism when the platform conveyor again starts operating.

With the foregoing operation, packages coming at random or following each other closely, of various sizes and shapes, will be separated and delivered, one at a time, in timed sequence to the scale and then into a labelling machine for affixing the label which was computed, printed, and delivered after the scale had weighed the package. The use of the live rollers in conveying a package to and across and from the scale avoids the requirement for devices such as cycloidal pushers and, thus, it is possible to have greater flexibility in the timing of delivery as well as the rate and distance of travel at the various points of operation of the mechanism. Maximum time is made available for making weight on the scale and less time is needed for moving the package. This results in greater production, since the speed with which some scales make weight is limited.

The platform conveyor mechanism is extremely simple and, as constructed and operated, does not affect the accurate weighing of the package. As stated previously, the mechanism on the scale platform can be part of the tare setting of the scale and the drive connection between the conveyor and the prime source is completely broken, so that movement of the scale platform during weighing is not influenced by any mechanism other than that directly on the scale platform. This avoids any mechanical or electrical connections to the scale platform during weighing.

The second embodiment of the invention is shown in FIGS. 11 through 18 and provides for a higher speed of operation than in the embodiment of FIGS. 1 to 10, with a more positive advance to and location of packages on the scale platform, and subsequent removal, and the avoidance of vibrations imparted to the scale platform which would normally require an interlock mechanism to defer the weighing action until vibrations had ceased by the use of a continuously-running conveyor associated with the scale platform but mounted completely independent thereof and without any engagement therewith. The structure of the second embodiment, insofar as it is the same structure as shown in the first embodiment of FIGS. 1 to 10, has been given the same reference numeral with a prime affixed thereto.

The lead-in conveyor, as shown particularly in FIG. 11, embodies the series of live rollers 35' extending between the mounting members 20' and 21', with the initial roller being 35a and extending to the final roller 35b which is adjacent the intermittently driven rollers 37 and 38' of the transfer conveyor. In the sequence of operation for the mechanism, as shown in the chart of FIG. the infeed conveyor rollers 35' are stopped when the transfer conveyor is feeding a package across the stop 36'. With a relatively long package, a major portion of the lower surface area, such as for package P, shown in FIG. 11, rests on the roller 35b and adjacent rollers 35', rather than on the rollers of the transfer conveyor. With the rollers 35 resting on the belt 76' and with this belt stopped, the rollers 35' thus provide a brake which makes it more difficult and less positive for the transfer conveyor rollers to advance a package across the stop 36'.

In order to make the advancing action of a package acros the stop 36 more positive, a series of the rollers 35' adjacent the end roller 35]) are mounted to be raised at one of their ends to be free of the underlying intermittently operable drive belt 76', so that these rollers can freewheel as a package is moved by the transfer conveyor. The loose mounting of the rollers at their opposite ends in the plate 20 permits this slight tilting action. In order to accomplish this, a series of five rollers 35' adjacent to roller 35!) are slightly shorter and, as shown in FIGS. 11 and 18, have their mounting pins 200 at the ends thereof adjacent the plate 21' mounted in a flange 201 which depends from a bar 202 extending toward the entry end of the machine and being pivoted to the plate 21 by a pivot pin 203, as shown in FIG. 11. This bar 202 overlies the rollers 35' so that it is free to move to the tilted position, shown in FIG. 12.

The action of the bar 202 in tilting the rollers occurs at the same time as the transfer conveyor rollers 37 and 38' are driven. This simultaneous action is caused by having the movement imparted to the bar 202 from the arm 103' which carries the belt which drives the transfer conveyor rollers. This structure is shown particularly in FIGS. 14, 15 and 18 and includes a threaded adjustable stud 210 depending from the bar 202 at the free end thereof to engage a boss 211 carried at an end of the shaft 212 which carries the pulley 102' for the drive belt 100' of the transfer conveyor. When the belt 100' is moved up for engagement with the transfer conveyor rollers by action of the low on the cam 106', the boss 211 elevates the bar 202 by acting on the threaded stud 210. When the mechanism reverses its operation, the weight of the bar 202 will cause the rollers 35' to return to their level position, shown in FIG. 16.

The other variation in the second embodiment from that disclosed in FIGS. 1 to 10 has to do with the package conveyor for delivering a package rapidly onto and off the scale platform with means associated with the conveyor to obtain rapid location of the package on the scale platform for weighing.

This conveying mecahnism includes a conveyor frame which is mounted for up and down movement between the frame 10' and the scale platform 13 and which is supported from the frame 10 completely independent of the scale platform. This conveyor frame includes a pair of spaced-apart vertically-extending arms 220 and 221 movable up and down in a generally straight line by being supported on a parallelogram-type linkage having upper mounting arms 222 and 223 and lower arms 224 and 225. The upper pair of arms are pivotally connected to the frame arms 220 and 221 at locations above the pivotal connection of the parallelogram lower arms 224 and 225. The upper arms 222 and 223 are fastened to a shaft 226 extending transversely of the indexer frame 10' and rotatably mounted thereon and the upper arm 223 has a cam follower roller 230 at an end thereof for following a cam 231 on the shaft 72' for controlling the up and down movement of the conveyor frame arms 220 and 221. In this embodiment, the intermittently operable drive mechanism for the scale conveyor shown in FIG. 3 of the embodiment of FIGS. 1 to 10 is omitted, including the cam 153 on the shaft 72 and the cam 231 can be positioned on the shaft 72' in place of the omitted cam.

The lower arms 224 and 225 for supporting the conveyor vertical arms 220 and 221 are pivoted on a rod 232 extending between the side plates of the indexer frame C.

. The upper ends of the mounting arms 220 and 221 each have an ear 240 and 241 extending upwardly therefrom provided with a pivot pin 242 and 243, respectively, on which a pair of side plates 244 and 245 are mounted. The plates 244 and 245 are held in a generally horizontal position by an'adjustable abutment 250 threaded in a bracket 251 affixed to the frame 221, as shown in FIG. 16.

The side plates 244 and 245 are interconnected together by a series of rods 255 and 256 whereby they can be moved as a Single member and carry a series of live rollers 260 extending from front to rear of the conveyor and freely rotatable in the side plates 244 and 245 whereby the rollers can be driven by an endless belt 261. The belt 261 passes about a pulley 262 at one end of the conveyor frame, an idler pulley 263 rotatable on the bracket 251, an idler pulley 264 fixed to a shaft 265 extending between the frame arms 220 and 221 and rotatable thereon, a take-up pulley 266, and a support roller 267 at the end of the conveyor frame opposite the pulley 262. The belt 261 travels from right to left along its upper reach, as viewed in FIG. 12 to correspondingly impart clockwise rotation to the free-running rollers 260 supported in the frame.

The drive for the belt 261 is derived from the drive chain 32' which extends about a sprocket 280 (FIG. 14) on the shaft 265 and which will partake of the up and down movement as permitted by the floating sprocket 57' engaging the chain 32 and yieldably urging the chain taut under the urging of spring 64 (FIG. 14). The rotation imparted to sprocket 280 is transmitted through the shaft 265 through the pulley 264 for driving the conveyor drive belt 261 previously described. The drive belt 261 is maintained taut by the yieldable take-up pulley 266 which is carried on an arm 285 pivoted on a rod 286 mounted to the indexer frame 10' and urged in a belt-tightening direction by a spring 287 connected between a pin 288 on the frame and an end of the arm 285.

The frame side plates 244 and 245 carry a series of rollers 290 which underlie the upper reach of the belt 261 and hold the belt in position to engage the underside of the live rollers 260.

In operation, when the package stop 36 is lowered and the transfer conveyor rollers 37' and 38' are being driven, the high-speed conveyor associated with the scale platform is in the elevated position shown in FIG. 12 whereby the rollers 260 are traveling in a clockwise direction and receive the package and move it to a position overlying the scale platform 13'. The timing of operation is such that the cam 231 will subsequently present a low area to the follower 230 to permit the frame arms 220 and 221 to descend and lower the driven rollers 260 whereby a package will come to rest on the grid structure associated with the scale platform. This structure comprises a series of grids or plates 291 fastened to the upper surface of the scale platform 13 and extending upwardly to positions between the rollers 260 and having their length extending transverse to the path of package travel. When the driven rollers 260 descend from the position shown in FIG. 12 to that shown in FIG. 16 the package is left on the upper edges of the plates 291 with the edges of the plates acting as brakes to provide a high degree of friction against the lower surface of the package and bring the package to a controlled stop with minimum coast. This permits a highspeed rate of travel of the rollers 260 while insuring that the package stops in a predetermined area overlying the scale platform 13'. After weighing, the timing of the system causes the rollers 260 to elevate while they are still rotating and the package is carried on to a labelling mechanism or the like.

As shown in broken line in FIG. 14, the conveyor mechanism associated with the scale platform can be moved about pivot pins 242 and 243 to the broken line position to expose the mechanism for cleaning or servicmg.

With the structure disclosed in the second embodiment, a continuously-operating conveyor is associated with the scale platform, but is at no time in contact there with and a package is placed on the scale platform similarly to placing a package thereon by hand which avoids the requirement for interlocks that might be required to make sure that the scale does not make weight until there are no vibrations.

With the continuous operation disclosed herein, the package detecting plate 40 and associated mechanisms disclosed in FIGS. 1 to 10 need not be included. In the event it is desired to use the scale for hand weighing, the system can be stopped, with the rollers 260 in down position, as shown in FIG. 16.

We claim:

1. A package indexer for advancing successive packages onto a weighing scale and then off the scale comprising, a frame, a package stop mounted on said frame and in advance of the platform of the weighing scale, a lead-in conveyor on said frame for receiving packages and delivering them successively to said package stop, a transfer conveyor on said frame in advance of the package stop for transferring a package across the stop while the lead-in conveyor is inoperative to advance further packages, means operable in timed relation with the transfer conveyor for causing at least a part of the leadin conveyor to free-wheel when a package is advanced by the transfer conveyor, and a power driven conveyor extending across the width of the scale platform and to a position adjacent the stop to receive a package conveyed across the stop and deliver it to a central location on the platform conveyor in one cycle and subsequently in the next cycle deliver the package off the platform.

2. A package indexer as defined in claim 1 wherein said lead-in conveyor comprises a series of rollers, an intermittently operable drive belt underlying said rollers, and said means causing fre wheeling including a mounting for a plurality of said rollers adjacent the transfer conveyor to lift said rollers off said belt and permit rotation thereof by a package being advanced by the transfer conveyor.

3. A package indexer as defined in claim 2 wherein said mounting includes a movable bar to which one end of said plurality of rollers are mounted, movable means for intermittently driving said transfer conveyor, and means on said bar engageable by said movable means to shift said bar and lift said rollers at the same time that the transfer conveyor is driven.

4. A package indexer for advancing packages to be weighed and subsequently marked with a weight and package price wherein the packages can be received at random and of various sizes and shapes comprising, a weighing scale having a platform, a package stop in advance of said platform, means for advancing packages successively to said package stop, and cyclically operable means both in advance of and beyond the package stop to move a package across the stop to a position overlying the platform scale, and means on the scale platform operable in response to relative movement with said cyclically operable means to hold a package off said last mentioned means during weighing thereof.

5. A package indexer as defined in claim 4 wherein said means on the scale platform comprises a grid structure formed as a series of spaced-apart plates with said cyclically operable means having a series of rollers interspaced with said plates.

6. A package indexer as defined in claim 5 wherein said series of rollers are mounted on a frame for up and down movement between an upper level to support a package above said plates and a lower level whereby in moving thereto a package is deposited on at least some of said plates, and means independent of said scale mounting the frame for said movement.

7. A package indexer as defined in claim 6 wherein said plates extend in a direction normal to the path of package travel to have the upper edges of the plates engageable with a moving package as it is deposittd thereon and hold the package against coasting to obtain accurate location thereof.

.8. In a combination, a package conveyor mechanism for intermittently conveying spaced-apart packages relative to a weighnig scale associated with a package labeller at a labelling station comprising, a weighing scale having a platform wiih aplurality of upstanding plates defining a grid structure on which a package rests during weighing a package conveyor having a series of powered elements positioned between said plates for selective engagement with a package to impart movement thereto, a frame carrying said powered elements, and means for moving said frame to place said elements either at an upper level to engage and move a package or at a lower level whereby the package is not contacted by the elements and the package is supported on the grid structure and free to move therewith in establishing the package weight.

9. A combination as defined in claim 8 wherein said powered elements extend to an edge of the scale platform 12 for conveying of a package entirely off the platform and to the labelling station.

10. A package indexer for advancing packages to be weighed and subsequently marked with a weight and package price whercin the packages can be received at random and of various sizes and shapes comprising, a weighing scale having a platform, a-package stop in advance of said platform, intermittently operable first means for advancing packages successively to said package stop, intermittently operablesecond means bothin advance of and beyond the package stop and operable when the-first means is not operable to move a package across the stop and onto the scale platfrom including a power driven conveyor overlying the scale platform, a drive for continuously operating said power driven conveyor, and means for lowering said conveyor to place a package on the platform for package weighing.

References Cited UNITED STATES PATENTS 3,353,653 11/1967 Arvidson l98-39 RICHARD E. AEGERTER, Pl'imaly Examiner.

Claims (1)

1. A PACKAGE INDEXER FOR ADVANCING SUCCESSIVE PACKAGES ONTO A WEIGHING SCALE AND THEN OFF THE SCALE COMPRISING, A FRAME, A PACKAGE STOP MOUNTED ON SAID FRAME AND IN ADVANCE OF THE PLATFORM OF THE WEIGHING SCALE, A LEAD-IN CONVEYOR ON SAID FRAME FOR RECEIVING PACKAGES AND DELIVERING THEM SUCCESSIVELY TO SAID PACKAGE STOP A TRANSFER CONVEYOR ON SAID FRAME IN ADVANCE OF THE PACKAGE STOP FOR TRANSFERRING A PACKAGE ACROSS THE STOP WHILE THE LEAD-IN CONVEYOR IS INOPERATIVE TO ADVANCE FURTHER PACKAGES, MEANS OPERABLE IN TIMED RELATION WITH THE TRANSFER CONVEYOR FOR CAUSING AT LEAST A PART OF THE LEADIN CONVEYOR TO FREE-WHEEL WHEN A PACKAGE IS ADVANCED BY THE TRANSFER CONVEYOR, AND A POWER DRIVEN CONVEYOR EXTENDING ACROSS THE WIDTH OF THE SCALE PLATFORM AND TO A POSITION ADJACENT THE STOP TO RECEIVE A PACKAGE CONVEYED ACROSS THE STOP AND DELIVER IT TO A CENTRAL LOCATION ON THE PLATFORM CONVEYOR IN ONE CYCLE AND SUBSEQUENTLY IN THE NEXT CYCLE DELIVER THE PACKAGE OFF THE PLATFORM.

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